Whistle
FIG. 1 is a top plan view of a whistle showing my new design; 
     FIG. 2 is a bottom plan view thereof; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a rear elevational view thereof; 
     FIG. 5 is a right side elevational view thereof, with the opposite side being a mirror image.